Feed mechanism for sewing-machines.



PATENTED SEPT. 17, 1907.

c. WINK/EL. FEED MECHANISM'FOR SEWING MACHINES.

APPLICATION FILED IAE.17, 1904.

UNITED STATES PATENT orruon.

CHRISTOPHER WINKEL, OF BELVIDERE, ILLINOIS, ASSIGNOR TO NATIONAL SEWING MACHINE 00., OF BELVIDERE, ILLINOIS, A CORPORATION OF ILLINOIS.

Specification of Letters Patent.

Patented Sept. 17, 1907.

Application filed March 17,1904. Serial No. 198,537.

To all whom it may concern:

Be it known that I, CHRISTOPHER WINKEL, a citizen of the United States, residing at Belvidere, in the county of Boone and State of Illinois, have invented certain new and useful Improvements in Feed Mechanisms for Sewing-Machines, of which the following is a full, clear, and exact specification. I

My invention relates to a mechanism for imparting the four-way movement to the feed dog and varying the length of stroke thereof, and it has for its primary object, to provide an improved, simple, durable and inexpensive form of feed mechanism for this purpose which shall be positive in all four of its movements and free from springs, or other like elements liable to get out of order.

With these ends in view, my invention consists in certain features of novelty in the construction, combination and arrangement of parts by which the said object and certain other objects hereinafter appearing are attained, all as fully described with reference to the accompanying drawings and more particularly pointed out in the claims.

In the said drawings, Figure 1 is a bottom plan of a part of the sewing machine head provided withmy improved feed mechanism partially broken away. Fig. 2 is a cross-section thereof, turned right side up, taken on the line 2-2, Fig. 1. Fig. 3 is a similar section on the line 3 3, Fig. 1. Fig. 4 is a detail section on the line 44-, Fig. 1.

1, is the base or plate of the sewing machine head and 2 is a shaft extending longitudinally thereof, similar to that employed in well known forms of rotary sewing machines for driving the shuttle or hook mechanism, and which shaft is shown as supported in suitable bearings 3, 4. At one point on this shaft 2, is secured a cam or eccentric 5, preferably a cylindrical member, secured eccentrically on the shaft, so as to keep its bearing against both sides of a horizontal fork or yoke 6 in which it rotates and which yoke 6 has an arm 7 rigidly connected to a short rocker shaft 8 which, in turn, supports the feed dog 9 through the intermediary of an arm 10 rigidly secured to shaft 8, and to arm 11 connected to the end of arm 10 by a slide 12, which is vertically adjustable thereon and held in place by a screw 13, or other suitable means for setting the feed dog 9 at the proper elevation. At

another point on the shaft 2 is secured a cam 14, and this works in a fork or yoke 15 formed on a lever 16, which is connected by a suitable link 17 and an arm 18 with a second rocker shaft 19, arranged below the rocker shaft 8 and supporting the latter by means of two upwardly extending arms 20, carrying cone bearings 21, or other suitable devices for connecting the arms pivotally to the shaft 8.

The cam or eccentric 5, by rotating in the fork 6, produces the necessary rising and falling movement of the feed dog 9, and the oscillation of the lever 16 resulting from the rotation of cam 14 produces the stroke forward and back by rocking or oscillating the arms 20 and thereby imparting a bodily oscillation to the shaft 8 while the latter is also undergoing the rocking movement induced by the cam or eccentric 5.

In order that the length of the stroke of the feed dog maybe varied at will, the fulcrum of lever 16 is made adjustable longitudinally of the lever, and to that end I employ a slide 22, having a set screw 23 accessible on the upper surfaceof plate 1, as usual in devices of th.s character, and the under side of this slide 22 is pro -vided with hanger, or two arms 24, projecting down wardly on either side of lever 16 and carrying the aforesaid fulcrum for said lever,,consisting of a pin 25 engaging in a slot 26 formed in the lever 16. In order that the lever may undergo the various movements to which it is subjected by this adjustment and by the cam 14, and at the same time be stationary with relation to the other parts, it is connected by a link 27 to a fixed part of the plate 1, one end of said link being secured by a pivot 28 to the lever, and the other by a pivot 29 to a boss 30 on the under side of plate 1 The rocker shaft 19 is supported by any suitable bearings, such as cone bearings 31, secured in bosses 32 on the under side of plate 1.

Having thus described my invention, what I claim as new therein and desire to secure by Letters Patent, is:

1. In a feed mechanism for sewing machines, the combination with a rotary shaft and the feed dog, of an eccentric on said shaft, a yoke embracing said eccentric and rigidly connected with said feed dog, a rocker shaft to which said yoke is pivotally connected at one end, a cam on said rotary shaft, a lever having a yoke embracing said cam, an adjustable fulcrum for said lever, a link anchored at one end and pivotally connected with said lever and a pivotal connection between said lever and rocker shaft.

2. In a feed mechanism for sewing machines, the combination with a rotary shaft and the feed dog, of an eccentric on said shaft, a yoke embracing said eccentric, a rocker shaft supporting one end of said yoke and secured to said feed dog, a second rocker shaft pivotally supporting said first rocker shaft, a cam on said rotary shaf't, a lever having a yoke embracing said cam, an adjustable fulcrum for said lever, an anchored pivoted link having pivotal connection with said lever, a rocker arm on said second rocker shaft, and a link connecting said rocker arm with said lever 3. In a feed mechanism for sewing machines, the combination with a rotary shaft and the feed dog, of a rocker shaft operatively connected to the feed dog, means operatively connecting the feed dog with said rotary shaft for raising and lowering the feed dog, a cam on the rotary shaft, a lever operatively related to said cam at one end and having operative connection at the other end with 10 said rocker shaft for rocking it, an adjustable fulcrum for said lever, and a link having a stationary pivot at one end and pivotal connection at the other end with said lever.

CHRISTOPHER WINKEL.

Witnesses:

JOHN W. ELDREDGE, C. B. A'rwoon. 

